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ardour { ["type"] = "EditorAction",
name = "Normalize All Tracks",
license = "MIT",
author = "Ardour Team",
description = [[Normalize all regions using a common gain-factor per track.]]
}
function factory () return function ()
-- target values -- TODO: use a LuaDialog.Dialog and ask..
local target_peak = -1 --dBFS
local target_rms = -18 --dBFS/RMS
-- prepare undo operation
Session:begin_reversible_command ("Normalize Tracks")
local add_undo = false -- keep track if something has changed
-- loop over all tracks in the session
for track in Session:get_tracks():iter() do
local norm = 0 -- per track gain
-- loop over all regions on track
for r in track:to_track():playlist():region_list():iter() do
-- test if it's an audio region
local ar = r:to_audioregion ()
if ar:isnil () then goto next end
local peak = ar:maximum_amplitude (nil)
local rms = ar:rms (nil)
-- check if region is silent
if (peak > 0) then
local f_rms = rms / 10 ^ (.05 * target_rms)
local f_peak = peak / 10 ^ (.05 * target_peak)
local tg = (f_peak > f_rms) and f_peak or f_rms -- max (f_peak, f_rms)
norm = (tg > norm) and tg or norm -- max (tg, norm)
end
::next::
end
-- apply same gain to all regions on track
if norm > 0 then
for r in track:to_track():playlist():region_list():iter() do
local ar = r:to_audioregion ()
if ar:isnil () then goto skip end
ar:to_stateful ():clear_changes ()
ar:set_scale_amplitude (1 / norm)
add_undo = true
::skip::
end
end
end
-- all done. now commit the combined undo operation
if add_undo then
-- the 'nil' command here means to use all collected diffs
Session:commit_reversible_command (nil)
else
Session:abort_reversible_command ()
end
end end
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